i have a 71 ,but check this out
Schumacher Creative Services shorty .BBCrysler true drop in from top, non starter encapuslating. work with 4 spd,like mine. these are the best for frustrion and ease. i have tried tti(bad 4sdp fit),mopar performance full lenth(scrape those speed bumps). the move to these was a no brainer.my spark plug changes are a JOY. i would also grab their torque strap w/ polyuethane mount(awesome!).
the power difference is minimal. the mid range is the same,but loose high power and low torque. i have ran all header systems through a true dual 2.5 " w/ H. old 50's series flowmaster mufflers dont hush it much.
i can snap pictures of fit in critcal aeras in my 71 cuda. i cant place them on the board so shoot me a email
mark