I need confirmation on what windsor engine I have. What I've concluded from my own research is that I have a pre '77 351 Windsor engine in my 1967 Mustang. I came to this conclusion after gathering the following information:
1) Valve cover has 6 bolts (so, not a 351 Cleveland).
2) The intake manifold has 8 bolts on each side (16 bolts total). This tells be that it's not a 221, 260, 290, 302 or a 77 or later 351W.

I also have installed on the car the following (previous owner installed these), but this did not help me much when trying to identify the engine block:
1) Edelbrock Carburetor 1406-0798 - numbers on the carb
2) Avtolite 124 spark plugs

So, did I identify the engine block correctly? I was unable to find the casting numbers, so I was unable to use that to determine the precise year. I know it should be close to the starter, but I can't find it. Would this be under something which is installed already?

Thanks!

 

yeah, under the starter

 

If the heads are on the engine, 351 is stamped on the head in the rocker arm area.