i have a 73 d100 sw bed ,with bad slant 6,i just bought a 400 b block and 727 tranny , i need some info on headers that will fit any ideas or part numbers would br helpful.also any other thing i should know about this big block swap.

 

Just did this in a 75, but with a 440/727. Heddman makes a nice set, they are available thru mancini racing. I got the motor mounts from a junk yard truck, did not have to make any k member mods. You will need a new tranny crosssmember mount for a B/B truck. Good luck!!