340 Timing / CAM Issue

I did a vacuum leak test with propane but it is running so rough, it was tough to get a read. Same with shorting out one plug at a time. I am thinking a vac leak in the valley.
It has a new distributor, pertronix CH-181.
Heads are redone with what looks like new HD valve springs and a new HD rocker assembly.
I was lucky enough to get a bag of receipts!
Thanks for the tips. I will update this post with results.
Jack