I got a 77 f150 2wd with a 351m and a 3 on the tree, i was wanting to put longtubes on but cant find any that will supposedly be a direct fit, from wht iv researched longtubes will interfere with the shifter linkage? Im not sure how much it would interfere and id like to be certain i could make it fit before buying. Has anyone put longtubes on with a manual that could give me some advice.