No bro thank god all my gaskets are good the onley one that was leaking was the timming cover its been pulled and replaced all my lower gaskets have been replaced,my mainafold is all good,but i do have a question,The man who built my car b4 i got ot done so much stuff to it one is he put 4.10 gears in the rear end,if im thinking right he would have done that for more top end speed right?,keep in mind i have the t56 6 speed...my damb speed om is off at least 10mpr...

 

4.10s would make for less top speed, but more acceleration. The reason your speedo is off is because the car isn't tuned for that gearing/tire combo.

 

look this place over, should be able to get the gears needed to adjust speedo

Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4