340 rear main choices- race motor

My 1970 stock type 340 block and crank was rebuilt in 1994 by me with the basic fel pro neoprene seal that comes in the kit set, and with a 10" deep baffled pan and 7 quarts of 10-30 no leak, shifting at 7000. fel pro has a performance R. A. C. E. set 2714. at the last build did u change the block + crank? is it an original T A block or moparperf T A replacement, and how are the oil directing grooves in the crank? maybe the pan gasket is leaking. did u put sealant between the #5 main cap and block to the left and right of the seal? I would not use rope