[renaissance man]

Well, it's been 20 years! I have my original car back from the 1990's!
I am getting her back on the road but, she is backfiring under load. I am in need of some ideas to look at?

Engine: '65 289 HiPo. .10 over, ISKY Cam. Holley 650, MSD 6A ignition, mechanical fuel pump.

- replaced the plugs. They were .035 gap. New plugs; .044 gap. The .044 gap I understand, is better with a higher performance ignition.

- 3 issues: Car needs 4-5 turnovers to get her to fire unless I spray starter into the carb.
- under load, she backfires quite a bit with some hesitancy as well. You can hear it. It did this with the old gapping plugs as well.
-Lastly, when I turn off the ignition, she will "Run on" for about 3 seconds before shutting down.

I haven't yet checked the timing

Any thoughts are greatly appreciated!

Appreciate you guys! Can't wait to meet up again!