why not have both: ) , just buy a 351w to 393 stroker crankshaft, keep the 351w stock rods, install your 302 pistons on the rods with new rings and have the assembly balanced.
There is your cheap reliable 351 stroker.
With the money you saved for using your football rods and stock 302 pistons, you can use to get the conversion parts you need.
If you have a 351w block that's in nice shape, I wouldn't bore it over, and just stuff those parts in, just install new bearings,rings and gaskets.
I have done this around 7 times and they last for ever, because you don't have to rev a 351 as high as the 347, and your torque comes on instantly, so no need to stay on the gas.
Can you imagine most of your torque coming on off throttle from first to second ! Do it
My uncles has 145k on it and counting. 415 HP 430lbs Torque with basic GT-40 Heads, Mild 351w Flat Tappet Camshaft, short tubes, 2.5" exhaust, 42lb Ford injectors, GT-40 intake, tune, only revs to 4,870 rpm, less noise, more GO
347 , 11:1 Compression,Knife Edged Lightened Crank,AFR 185,Ported Trick-flow Intake,Ford X-CAM,Under-drive pulleys,aluminum drive-shaft, 3:73 gears,Fender Cold Air Intake,Long tube headers,MSD Digital Ignition System
444 HP 436 FtLbTrq. high 10 second car !