After posting it occurred to me that he probably had a small block. I thought I had deleted my post but obviously not.

See if any of the stiffer beehive springs from Comp Cams or PAC fit the required specs. As with all springs, check pressures periodically.

I don't like cutting rockers for clearance because I've seen too many break there.

With that particular head/rocker combo, rather than trying to reinvent the wheel, I just use cam lobes that will work with springs that fit those heads & rockers.

From what I understand, the T&D's will clear the 1.55 springs.

With a little spring pocket cutting and tall retainers, you can get 1.900 installed height....... So, that combined with the T&D's opens up the spring selection quite a bit.

However, you're still dealing with 5/16" hold down hardware.

I have used either Comp or PAC for a blown SB Chevy years ago that where 1.440 O.D., I don't remember the exact installed and open pressures but I'm sure they where above 225 Lbs. on the seats and over 500 lb. opened
I think they where dual spring with a dampener.