Frustrated

What do you know about the engine? What heads? How sure are you the compression is where you think? The few things that scream out to me are "318", "10.5:1", " 3" duals"... If I had to guestimate what's going on I'd say the engine is over cammed by about 12% and the true compression is closer to 9:2:1. The 292/.508 MP cam is around 248°@.050" which is HUGE for a mild 318. The KB-167s with the typical deck clean up cut, and 318 heads, with a std FelPro gasket brings it to about 9.2:1 static, and that cam, comes in around 7.5:1. Those add up to a soggy low end. You have the makings for a good combo. If it was me, before you do anything else, swap the cam for something in the 220°@.050 range.. NO larger than 225°. The convertor you have is ok. The 11" std performance convertor is fine but the 727 won't be as responsive as the 904 would in the same car. The engine's lazy so the convertor can't work right either. It's not the suspension or the displacement IMO. I tuned a mild 318/904/3.23 car that would spin the tires from a stop all the way into second (about 60'), then it caught and it had the same suspension mods and larger tires. Get your hands on a compression gage and post the test results after pulling all the plugs (warmed up) and the throttle wired open. My impression is it will be relatively low.