I am having the block sonic checked and magnafluxed and then off to the machine shop.

I was hoping to save some bux by using as much off the old blocks I have on the new.

What exactly should I consider reusing? Can something like main caps be reused or must they be new? The oiling sytem for example? Distr. gear?

The second question is what is the most the compression can be if the gas is 91 here? I mean if I dialed the timing back for the street and used the 94 you get off island.

How much compression can I use with aluminum heads and less timing?