I have a old crate motor I bought years ago and put it in my 89 mustang. The company that built it is not around anymore and I am having problems. The motor has TFS heads and scorpion rockers. I topped it off with tfs intake a 65mm throttle and a Ford cobra kit(injectors,throttle). At this point just want a good driver not out to make a street racer. It has a custom cam made for the motor by them. I had a adjustable regulator on it untill I pulled it off after it would not stop leaking. Car runs but is not running right. Pops out of the exhaust and does not like low idle. Motor just does not sound right. I have fixed many little thing to get to this point as resetting dist. The lifters are very load also. I am thinking maybe they are not adjusted. I have a pair of short trick flow valve covers. MAybe they are hitting? I had them off before but saw no marks on the covers or rockers. But before I pull the top of the motor apart I just want to get some thought how to fix this.