Shave 50 thou off the head, tripple carbs, lumpy cam, port 'n pollish, lighten flywheel, sports coil the list goes on, but this is a start,
My "59" Zephyr had 70 off the head, extractors, 4 su's, port'n pollish, 4 sp Riley bag and solid clutch plate, 70mph in 2nd, blew the tops out of 2 pistons at 160mph.
Back to the drawing board lol.
EVEN had VALVE radio LOL.