I have a 1991 Z28 and it has the original 305 TPI in it and I am thinkingabout building anew enine any suggestions on wut kinda block i should get?

 

87 and later short block. two bolt mains are all you will need. Note: that picture was of a very diirty engine compartment. This is a clean one of a 350 TPI

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screw the 350, get a 400 small block and build it from the crank up , people will be thinking ' Oh its just another 350 camaro" and then bam you blow them off the road.