The mellonized distributor gear is available through GM for the 96-02 trucks if you need the smaller. A lot of guys have done this swap, and other than the intake and a few brackets it is a drop in deal. And buy a cheap return style regulator for your fuel pump to drop it down to 4-6 PSI(you already have a return line, utilize it to prevent vapor locking). Your current TBI throttle cable should even swap over and work. You will have to make a few brackets for up top to hold the alternator and A/C compressor since you won't have the intake bolt holes for the brackets. But all of your mounts will swap right over, make sure you get an engine for a stick shift since you will need a pilot bearing(GM didn't drill out the end of the cranks in all engines for a pilot bearing just a word of warning), your current water pump will swap right over, as well as your accessories. HOLLEY, GM, EDELBROCK, and a few others make them, but expect to pay almost $300 for one new. The intake is the expensive part of the swap. You will have to buy the special mellonized distributor gear if you run the stock VORTEC camshaft as it is a billet roller cam and the stock HEI gears will not last long at all. Your bottom end is already basically the same(except for pistons and camshaft) as the vortec 5.7L. It's a bolt in install for the most part.
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