-6 degrees overlap is pretty much the limit with a spot on tune. That drops you right underneath the 224 range on a 114 LSA with xe-r lobes.
Rumor on the tech is that someone passed emissions with the tr224. I can speculate that if its legit, it would be due to TR cam lobes being less aggressive than xe-r.
Max effort to pass emissions with your nature killer would prob be a 220/220 114LSA or a variation forward/reverse split. IMO I would come up with a forward split to get a little more up top since you already have a 3400 TC. Quickly looking at LT1 shelf cams, the 218/224 on a 114 would be nice and still have pretty good top end.
Luckily, you have an auto and it will run much better on a 114. Also, since you have LE2 heads, a smaller cam will produce great results given that you dont have to over-spec duration to battle stock flowing heads for more power.
107 LSA FTL
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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