360 tune up help needed

update well its running alittle better me and my father in law tinkered with the timing and adjusted the carb alittle bit now it doesnt have a studder upon acceleration still kinda doggish but will spin the tire around the corner my father in law noticed alot of black soot and some black gunkie stuff in the carb probillay from running to rich and back firing alot when it was on the old 318 gonna get some carb cleaner spray and new air filter maybe that might help it out of the doggishness then we'll adjust and tune it some more on another note i noticed my oil pressure gauge was slightly below 20 psi when idling? im running 10w 40 valvoline conventional do you think i should run a heavier weight oil? still searching for my dwell meter it has a tach on it so i can tune it alittle better, might break down and buy a cheap tach from advanced auto or auto zone