Take a guess where the bottle neck is!

It just falls on its face at 5K, like there is nothing left, pulls real hard all the way up to it. Been a while since I ran it up to 5K though, the track isn't close and with the 3.23's I really have to stretch it out to get to 5K and I kinda don't want to risk it on the street. The more I think about it the more I think it is the ignition. It is an older MP electronic conversion kit I bought back in like 99, that has the orange box. The fuel lines are stock 5/16's line. Could be the fuel pump. I've been wanting to convert over to an electric pump, but I just haven't been able to get to it. Filters are good, I changed the fuel filter recently when I was chasing a problem on it, and the air filter looks good.