i need the number for a set of hotrod springs. told that they are the only ones that will support the 351w.
we still have 6-cylinder springs in ours. Even have them on the (ex)-turbo maverick. All that weight of the turbo, headers, and everything else on the 302 made it weigh about as much as a 351w would....and had no problems. We even cut a coil and a half off both cars. Perhaps someone can get the part # you need, as I have never used anything but stock springs.
Dont believe that There wont be any problems with either 6 or 8 cylinder springs ( 6 will ride a little lower but will give more front end travel )