hello all. i'm in the lingering process of stroking orig 289 block to 347ci w/AFR185 heads, 600cfm Holley 4V, manual 4-spd... just for the streets + highways. what long tube headers fit my application w/out hitting speed bumps + having spark plug access? 1 5/8" or 1 3/4" primaries? options: Jet Hot Hooker Competition, JBA's, Doug's, FPA, Hedman