Your doo dealer will have all the parts needed. Buy the short boots from a 95 Mach 1. The base gasket is a standard part as is the 501 valve. You can also modify your existing valve to get it timed closer than a bought one.
slowhand.....I would go to the crankshop for your mods,they have a ton of mods in there catalog for the 670,they also have the reputation to back them up.they also have a 740 big bore kit for it,it put's out alot of torque.If i were you thats where i'd go.
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