I have a 351w swapped into my 84 Bird. The problem that i am having is that when it is ran hard for awhile, it will develop a miss during1/4 mile acceleration. It acts like it is running out of gas, but i dont know why it would only do it when it was hot though. Maybe the coil is failing when it is really hot. Any help will be appreciated, thanks, robert.
A hot engine is more pr0ne to detonation. Maybe you should try knocking a coupe degrees off the timing?
could also be the fuel pump starting to go. Check your gas pressure.