727 46RH conversion coming

What are trebligs manifolds please?
Trebligs manifold are a set of exhaust manifolds he use to sell here that consisted of a driver side 340 and a passenger side magnum that he milled out to 2 1/2” on the outlet for better flow. It allows you use eliminate headers on street cars with a minimal horsepower reduction and a stock look with more working room in those areas.

@transman what year did the 46RH change? I have an 88 for rebuilding? Thanks.
My 46RH is from a 95 Dakota. 96 was the changeover year to RE models. Your asking the right guy for sure on your 88. There’s a ton of info on A500 and A518 RH models here.