There are three (3) oil pans used as stock on various models of Cleveland. #1 is an open bucket with no baffles at all, used on 351-M and 400s, mostly on trucks. #2 has a horizontal baffle surrounding the oil pump pickup. This is the 'std' pan for 351-4Vs. #3 has the horizontal pump baffle and a rudimentary crank scraper spot-welded on the sloping part of the pan. This is the so-called 'Boss' or 'HO' pan. All are useless for a Pantera, since even moderately hard cornering or acceleration will force oil up the sides of the pan, uncovering the pump pickup and allowing it to suck air.This then runs the pump and bearings temporarily dry. I've seen a single 3 hr open track event waste the rod bearings and break rods in a STOCK Pantera. It happens quicker on big-tire cars or with modified engines.
Aviaid, Armando or maybe Kevco make fully baffled competition '10-quart' oil pans with their own pump pickup. They should be mandatory for ANY Pantera. Most knowlegeable engine shops will not release a rebuilt engine without such a pan installed. They are fully semi-pro-race-ready as well and bolt on exactly like a stock pan, using stock bolts, gaskets, seals & a stock flexible dipstick. There are no known drawbacks except price and the extra 3 lbs of weight. They are semi- expensive ($500 or so) only if you ignore the cost of replacing the block or crank while running a stock pan, assuming you actually drive your Pantera on the street. Do not waste your money on a stock pan; it is the equivalent of running pickup truck tires on a competition car.