620 isn't too much for the Z. I know someone that has a 600hp v8 in a Z and he autox's just fine. That and with the proper internals,bore,stroke, turbo, fuel etc...you can make that out of almost any motor. Remember he got himself a fully built no budget race motor. It's second hand but mind you he got one so didn't have to front the high cost of building it. Now when it comes to the body and stuff his lucky that the Z is a sectional frame layout. Where you can replace any part of the car by simply removing a few/lots of bolts&nuts and a little cutting.
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