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Really your rpm range is going to dictate where you spend your money. Forget the 383, keep your stock crank, clean it up, if you can you should get forged rods with arp bolts along with forged pistons, new bearings and arp hardware throughout, and put the rest in the top end deciding how stout it needs to be with your cam's power level. Use a stock flow gm pump with a high pressure white spring along with the arp drive gear. Have the pickup tube brazed to the pump body as they are known to fall off. See how much slop is in the timing chain. Price all that out before you spend your money. See what good machine shops are in your area. They will have to tear down the short block to really know how much work it needs but its a necessary step. Your power is going to be made with your heads and cam. A package from lloyd elliott or advanced inductions would suit you well. Bump the static compression ratio up some as well, 11.5:1 would be fine but 12:1 would be better pending cam selection.
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