Earlier this year due to some oil pressure issues we swapped out a 67 327 for a 72 350 in our coupe. Engine was pulled from a truck and had no problems so we stuck it in hoping for some summer cruzin. It seemed to be doing fine but.... Here is the question/problem, we just returned from the Goodguys Nationals in Columbus and for longer weekends we pull a small trailer for cooler ect. We noticed on pass side of trailer there was a bunch of oily specks looks like coming from pass side exhaust. We put 600 miles on before this trip but had never hooked up trailer so didn't know this was happening. Engine has good oil pressure. Would this be something like oil seals or rings or what, where should we start to look for a repair or is it even a problem besides trailer cleaning? Drivers side looks fine so just on the one bank.