Making power out of the 318
oh, and if you stay with the 318 sourcing the bits that you need shouldn't be difficult at all. hell, most of us got stuff like that littering the shop floor or collecting dust on a back shelf somewheres.
or, there's smattering of 73~76 a-bodies (and trucks/vans) in local yards that you can rob the ancillary pieces you may need: oil pan, timing cover, pulleys, brackets, exhaust manifolds, transmission, motor mounts.
and spring fling is right around the corner, the swap is a good size and there is always tons of good parts and great deals.