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Re: Compression ratio and smog levels.
I dont do smog Era motors but I do know that a good tight quench is a good thing. I would zero deck it and run whatever piston that is closest to a flat top that hits the 9:1 ratio. That should be a pretty good setup and allow it to be slightly decompressed if needed. Being this isn't a runner of a motor I would run whatever head has the best low flow and velocity numbers. He wants it to grunt so make it a stump puller. Who cares if the heads are maxed out for this application.
On a separate note be prepared to do some computer tuning. I did a rering on a 03 jeep 4.0 and moved the cam 4 degrees. Computer did not like it at all! It ran alright at 1/4 throttle buy sucked above that.
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