hi tech comp push rods are not very good .how did you know they were the right length for the lunati roller lifters ?did you do a mild lift check .how much cam lift. did you check that the oil hole in the lifter is not past the lifter bore in the block .how big did you drill the front galley plugs out to ? your dist is worn out shaft is to loose. you say it a loose bottom end whats the oil clearance s on rods and main bearing .rod side clearance . where is the oil pump pickup setting in the pan. dist body loose in the block. how hot are you getting the engine. is the mains studed did you check that the oil pump sitting flat to the main cap .you did not say whats low oil psi ? oil psi builds when RPM moves up? did you check oil pump end play ? did you weld the pick up on the oil pump .there alot of long push rods in a bbc oil is not going to fly up to the rockers very fast. did you check that your not burning up your push rod tips you did post on this last year ?