I overfilled my Pinto with oil, was way over the maximum level. Only differenct I noticed was blowing some oil vapour out of the filler cap on the motorway, I've drained some out now but I prefer to run it on the fuller side because I know that the oil does surge a bit with a shortened sump regardless of how well its baffled.
Also, a lot of Pintos in kits seem to be fitted so that they're low at the front (probably to clear the bonnet). The attached (not brilliant) image shows the angle difference between the engine and the carb mounting flange - the carb flange should be horizontal (and clearly isn't on my car). In addition to the engine being tilted forwards and the oil being slightly more forward in the sump, the oile in the head also has more difficulty draining back down into the sump through the drain hole at the back of the head.