i've been wondering if anyone with a 68-72 chevelle with a/c has a tall deck big block? i've just been wondering if there are any clearance issues.

Will you be running a stock brake booster?

i have manual brakes so no booster.

I am running a tall deck in a GMC SPRINT with no A/C ,but it got power brackes and there is more space between the cover and the booster ,not sure if a tall deck cover would fit but I am sure a thick gasket should fit to run roller rockers ,the new roller rocker are on the way I let you know what happens went I install them with the stock covers and do some mod the oil baffles and the mr gasket thick gasket

I even are using the tall frame mounts to use a 8 quart racing oil pan ,if you use the low frame mounts there should be more space ,NOT SURE IF THE A/C would work ,but I got P/B AND STILL SPACE .

headers can be a problem, more so if using aftermarket heads with raised ports. No one makes off the shelf headers to fit a tall deck.