I have a problem with my Holley 600 (4160)

Moper, you have a good point I think that besides the heat problem I MAY have other tuning issues. I am by no means a tech or a mechanic or by any description very knowledgeable.

The car is my girl I have had it since 1985. Everything good, bad or indifferent I did up to this point. I have a LA318 with closed chambered high compression heads, 280/380 cam, competition 3000 stall converter, 904 tranny with a B&M shift kit a 8 3/4 (489) with 3.23 gears that is about it. Now I started with the problem I told you guys about. I put a new power valve, 4.5 and jetted down from 69 to 65 jets because I thought it was a little rich and it was breaking up under full power with the 69. Well, now it is breaking up, missing, stumbling with the 65. I don't have a timimg light so I bought tape and it lasted long enough to let me check initial timing at 30-35 before the tape broke. I'll have to buy a light with advance, it will be cheaper than tape and less in pain in the a''. I don't know what is going on and I don't know anyone to come help. Hope you guys can help like before. Oh yeah, I have a Mopar electronic ignition with the stock red/orange module.