stay aluminum block and unless you plan on spraying alot of NOS then a iron block realy aint needed. my ls1 with gas moves pretty good for having a stock ls1 intake stock heads and a cam and headers. so with what you got now would work pretty well. if its a stock rear i would worry about that the most with a manual trans by they are alot harder on launches than a auto. just get it and start sinking money into it. it will all be ok
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IM BAD BOB
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