I gotta jump in here. I have a 1960 stock 261 engine. I am trying to keep all the drive train pretty much stock but my car is a daily driver and I speed some on the highway. According to my calculations I am turning about 3100 rpm at 70mph. This is with a 3.55 rear rear and 27" tires. From what I am reading here this should be ok without damaging the engine? I want to , at least keep the engine but if I can't maintain highway speed I might upgrade to a 200 r4 with open drive line. I just installed a tach so when the weather breaks I can get a better idea of true rpm.
Thanks , Pete
