69 k5 hei/dui
 

I’m going to have my 400sbc back in soon and like to upgrade to an HEI. I know the clearance is an issue... just how close will it be or how much will I need to modify. I’m looking for something solid and bullet proof to get this beast through the grueling Baja miles. DUI has great reviews and awesome customer service so far. They said as long as I have 3/4 of an inch clearance it’ll work. Thx for any help you can provide