[Ole Don]

All good advice above. I would remove the heads to check valve sizes. If they have a fresh valve job, mill the heads .020 or .025 and use them. The heads have a squared off spot on each end. Mike that. From the factory they were exactly 1.000 thick. The easiest way to remove the cam is to turn the engine upside down. It then slides out after the retainer behind the gear is off. Keep the spacers in order. If the cam appears stock, you can ship it to a cam grinder for a spirited street grind for about a hundred bucks or less. Look in at the lifters with a bright light, they seldom wear out. On reassembly, use liberal amounts of cam lube, and motor oil that is 30 or 40 wt and specifies HD for its cam protecting zinc additive. Read up on installing the chain. If you want a lot of RPM's, put on better valve springs, and use a lot of timing advance. Have fun, these engine respond very well to small changes like this. If it will be a street engine, a 500 CFM will give better results than a 600.