OK, I'm dumb, need help

There used a be a guide to angle milling the slant six head over on slant six.org for more compression and adding some quench for burn effiency. THe 198 blocks and 2.25 were the same, the 198 was a de-stroked "econo" version of the 225 with a 3.64 inch stroke and 7.006 rod. I have only seen one that I was aware of, but the stock performance was identical to a 225 in an a-body. Most hardcore slant six racers use the 4-1/8 inch crank with the longer rods with lightweight pistons. If you look up Pishta on his home page, he has some homemade intake setups if you choose to be in the "dare to be different" club. A properly built homemade intake or one of the Chrysler hyper-pak manifolds are the best bet. The best 225 to build IMO is a pre 1976 truck engine (cast after '76) with a manual transmission because it had a forged shot peened and flame hardened crankshaft, and adjustable rockers with solid lifter camshaft (up to 1980). They HD crank isn't really necessary for a mild build, though, it's more of a boosted application deal.