340 Static Compression Numbers and Test Procedure

Mattax said

If you're getting detonation at 2500 rpm, 28-30* then quicker won't work.
Back to figuring out what's going on in there.

Locking out.
Sometimes its done.
Disadvantages are usually in getting good idle, and with a high revving engine, there can be timing 'lost' at the high rpms. (racing high, not street high)

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I hear ya. Will hold off trying to tune further until I get some decent gears in there (3.55 or 4.10). The detonation which is mostly if not completely under control right now IS being exacerbated by the load which is FU#$% up because of those gears and probably the converter. I was told it was a high stall torque converter but I think I was lied to and the guy skipped out of town. He is not somewhere in Minnesota ripping off people...