I have a 88 d100 & 86 w150 both have 440 engines and I run 2 sets of the hedman 79250.

nice fit & work 2x or 4x4 chassis.

has ball cone collectors so no gasket down low to blow out. lots of room for a mini starter and tubes are not below frame rails (well the 1 collector bolt does hang a little lower than frame rail)

IIRC these are the same ones Bouchillon sells in the BB swap kit.