Roger on the trans vacuum modulator being hooked to full time vacuum.

Let's back up a bit on the distributor. More info would help.

- What high performance equipment did you use?
- How radical is the camshaft?
- What carburetor is on the engine?
- Do you have a stock or a high performance distributor? HEI, I assume. If not, what is it?

All of this is important because a distributor often has to be recalibrated for a performance engine. The stock vacuum can may put in too much vacuum (or too little), and at exactly the wrong time.