71 Duster Timing

I just finished installing a sniper EFI kit on my 71 Duster and the car is reluctant to start without giving it gas and stalls after idling for a few minutes or when I try to press the throttle too quickly. If I try to get on the gas without easing the pedal down it's like there's no gas for a second and then it shoots up a few thousand RPM, pops then stalls. I think this is probably a couple of issues including timing. The sniper tuning is new to me so I don't know what settings to really play with to get the car to drivable. If anyone could provide information on where I should start with timing or anything that may get the car running well, I'd greatly appreciate it. I have a couple data sets from the sniper that I can provide

71 Duster 318
340 heads
edelbrock intake
sniper EFI and full hyperspark ignition system
street/strip cam
timing at crank and idle- 15.6
timing at WOT- 40

EFI DATASET.jpg