the 351 w is about 100 to 150 pounds heavier than a 5.0 block. As far as early 80's truck motors im not even sure, and as far as camshafts, the 351 has different flow characteristics, you could use it, but i would decide what kind of power and the power band in which i want to operate and then pick the right cam from there. and that might mean going to a comp cam or crane cam grind instead of the alpha bet cams. Remember, a larger motor digests a larger cam easier than a small motor, so if your power band on a 302 is 3000 to 6500 rpm, then in a 351w it would be more like 2500 to 6000 rpm. So remember, a 351 will digest a larger cam easier and have better bottom end torgue with the additional cubic inches.
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1983 mustang, 393 cubic inch stroker small block, victor jr heads and intake, gold race 1.6 roller rockers. comp cam 304, 244@ .050. .576" hydralic retro roller cam,lunati rods. block was o-ringed,10:1 forged pistons, speed pro fit fit rings, clevite bearings,msd distributor and igniton,be cool huge radiator, black lite electric fan, march underdrive pulleys, mildon deep sump oil pan, mac 1 3.4" long tube headers, 3" dr gas x-pipe and mac exhaust,ARP bolts. car weighs 2900 lbs w/out driver, sub frames, weld wheels, mickey thompson sportsman pro 26 x 10.5 x 15's,#8 fuel line steel braided
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