Seriously, for the $$ spent, why not find a good running 360 from a truck/van, add an aluminum intake, 340 manifolds, and mild cam, re-use the 360 converter and your 302 heads.

Around here, I've found several late 70's trucks/vans with good 318/360's for under 1000, most being in the $500 range. Sell whats left over for scrap.