I've read conflicting reports on this but do you have to notch the cylinders with 6.4 heads on a 5.7 or will the valves clear? I thought I saw a build on here where a 6.4 head will clear a 5.7 bore (close but it does) but several "experts" on sone Gen 3 groups on FB howl that they don't. Oh and if the heads are coming off may as well put headers on as well (it's very easy to spend your money lol)