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I have a 77 f150 with a 351m. Just swapped the intake and carb to the 4 barrel. Now wants its warm is looses power, sputters, and if I floor it it backfires out the carb. I've replaced the coil, put hotter plugs in, I know I have good fuil flow, brand new air filter. I'm letting it warm up before I drive it and I can only go about 5 to 10 miles before it decides to run like crap. I was thinking it might be a cracked distributor but I'm not sure. Any help is apriciated.