I think 110s are going to be way too light, it will be bouncing off the snubber constantly.
You need min of like 190s, if not 200s.
IMO, the GW springs are pretty much the go-to, like these:
https://www.globalwest.net/firebird-...1980-1981.html
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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