318/360 Crank/347 running on Dyno

302 heads are a closed swirl chamber 318 smog head-they were installed in late '84 318s up to '91. Small chambers, with small shrouded valves. Hot Rod did a junkyard jewel 318 build with a set of those several years ago; netted like 375hp after porting them out to 340/360 port sizes, installed 1.88/1.60 valves, and did some serious chamber work. They used a 200k short block with hand blended valve reliefs, and notched the cylinders a little with a Comp XE275HL cam, and IIRC, a dual plane intake, stock rockers, and some 1 5/8" headers.

If you either want a stock 318 or you don't mind putting the work into them, they can be made to run well, but the money you'd sink into them could arguably be more easily invested in a set of Magnums for a bolt on increase in power and torque. But-they retain the LA rocker gear...and I think that's why they're very attractive to some folks.

EDIT: I stand corrected-they made 404 with it, after some swapping of intakes and carbs. Another thing about those heads is they don't require much timing lead because of the fast burn chambers. The turbulence propogates a very quick combustion, so less timing is needed, therefore less prone to detonation. Here's the article:

http://www.hotrod.com/howto/113_0304_318_small_block_build/viewall.html