The jets I have are the (stock?) 120-4098 = .098" .I'm planning to put this TQ on a 440 and I found in the -73 FSM (first year TQ on a 440) that all 440 had 75-1966 rods. So that's what I'm trying to achieve. Finding a pair of 75-1966 or something close would of course be the best solution. Primary jets should be available if needed.