270 is too much head for a 383. The 240 would require a potent short block to take full advantage of the port.
specs of the rest of your combo would be nice.
Thank you for your reply, I have a 750 double pumper, a 5000 stall converter in a two speed powerglide transmission, and a 4.30 rear axle. I race 1/4 mile and only have one track here on the Island. Let me know if you need any more info on the car.
