My '67 Fleetside C10 renew

[Bomp]

I noticed in the info on the headers it stated:

1967-91 Vehicles: Part# 69090 & 69230 may require removal of Rubber Snubber
mounted on right side frame rail w/ 3bolt bracket, to complete installation. ........... I believe this would tilt the motor down enough for clearance.
Link to the page I read here ~~~~~>http://www.jegs.com/i/Hedman/500/69010/10002/-1
although yours are 69010, correct.

I'd try every which way before cutting the header cause that'll void the lifetime warranty.
Rootin for ya. You'll get it.
Its probably not an option on this build but you know I'd have that floor hacked up by now. Mmmmmmmmm hackin'