I am able to use the stock headers (creatively re-contoured) with my Gt40 heads but I would like to go to some long tubes, since plug clearance is a PITA with these heads what would you recommend?
GT40's take any header. P heads are the ones that cause issues. But my dad swapped in a 351 (with P heads) into his SN95 and used Flowtech equal length long tubes and I believe he used a very short 90 degree plug wire boot and managed to not have to bend his headers at all to get enough clearance.