thats what i've been seeing around here....i'll deal with a couple hours of pain to be cheap.
what would some good after market heads/ cams be or would it be worth the gains?

 

I'm not really sure. I have heard of some significant gains from cams swaps for us. Like +40hp. I haven't verified that. One guy on here posted a FR500 cams/heads package that was only like $1400. Looked like a hell of a deal.

 

so are the guts on the mod motors that much more expensive?

 

Not really. The extra two cams is what jacks up the price for a 4v. I looked at lethalperformance.com last night and they had some cams for $895(all 4 included). I was reading about our heads, and people were saying that the 4v head wasn't worth replacing, but maybe porting. That's about all these aftermarket heads are anyway, just ported and reworked stockers. Here is a thread I found talking about them.
https://mustangforums.com/m_4271115/tm.htm

 

so if i port the heads and change the cams im gonna net ~50-70hp?
thats like the LS1/LS2 gains...thats impressive.

 

Definetly, give or take depending on how agressive you go with your cams.

 

huh, im gonna paper build a setup right now so bear with me an tell me what you think

mach block
forged rods
9.5cc dished pistons (n/a sotck like as another option )
ported heads
agressive cam (sorry dont know anything about mod motor cams)
d1sc intercooled @ 11psi

any ideas on numbers?
S/C=??
n/a=??

 

I found this article related to the OP....it starts out talking about the Bullitt, then the Mach....

On the exterior, the car received unique Torq-Thrust style wheels, removal of the fog lights and rear deck spoiler, as well as new trim accents. It was available in three colors: Dark Highland Green, True Blue, and Black. The success of the 2001 Bullitt led to the production of a second special edition, the 2003 to 2004 Mach 1. This Mustang was a new model and not simply an upgraded GT. The Mach 1 was equipped with a unique R-Code 4.6 L DOHC engine based on the DOHC engine available in the 1999 and 2001 Mustang Cobras, with new cylinder heads from the 2003 to 2004 Cobra (see below) and camshafts from the 5.4 L Triton engine. The engine was rated at 305 hp and raised to 310 hp in 2004 (a Hot Rod magazine actually dyno-tested 2003 Mach 1 and found it to produce approximately 325 hp).

 

^^those are some nice numbers, and that would explain the same suspension setup.

 

http://www.lethalperformance.com/pag...-heads-lh.html

These heads are claiming a 60hp gain if used with FRPP cams and exhuast. I assume they are talking about their crappy FRPP shorties, in which case you might as well stick with the stock manifolds. I'm sure you could go with a better street/strip cam and get alot more gain. The only problem with going with race cams, or over 224 duration and more than .50 lift is that you'll lose a lot of low and mid range torque. The way I see it is, let the 4.10s take care of the low end torqueand go with a goodmid-range cam. That way you're not sacrificing anything but the 6100+ rpm range, which is rarely needed anyway since Machs begin getting out of their powerband by then anyway.