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Last summer I upgraded my 350 with Blueprint aluminum heads and a Howards Retrofit Roller CL110235-12 Cam kit (213/217 @ .050). The result should be about 325-330 HP with my stock exhaust manifolds, and should probably run about 350 HP if I had used headers. It runs about 17"-18" of idle vacuum, and pulls smoothly on the street (slightly rougher idle than stock).Everything went well, but I spent a lot of time hanging over a high 4WD engine compartment getting all the parts installed. The total bill was more than I expected because I chose to make other upgrades (full roller rockers, which needed tall valve covers, timing cover with adjustable cam button, etc.). In retrospect, it probably would have been easier and just as cost effective to buy a new crate Vortec 350 for about $2,600 and replace the entire engine. Or buy a crate 383 at 430HP/450 torque for $4,000. Even the upgrades would have been easier if I had pulled the engine and did it all in the garage.Its hard to get the old 350s up to a good compression ratio if you don't change pistons. Most of them run closer to 8.2 compression, and the 64cc heads add about 1 point of compression. I used a thinner head gasket to get about .2 more, but that still only gets me up to about 9.5. For the cam you listed, 9.5 compression should be find, but for higher lift cams (for example, 224-228 @ .050 and up) you really need closer to 10.0 compression to make it work effectively. Big cams and low compression don't work together well. I also strongly suggest using a roller cam, and preferably with a roller-ready block to make installation simpler.I learned a lot by adding parts to the old engine, since I had to research all the combinations of parts, and I was was doing all the wrench work myself. However, buying a new crate with a nicely matched set of parts is also a great solution.Bruce
http://forum.73-87chevytrucks.com/smforum/index.php?topic=32168.msg271442#msg271442read that, they talk about buying a gm crate motor 260 for around 2k and swap cams to push 290/420.
50 hp for 2k? the only time i turn over 3k is when im mudding. towing you wont be going that fast and you want Tq for that. street driving even 420 sounds like fun. but you also have to think about at what point will other parts like your trans fail due to the power increase.