Talked to a guy in Niagara Falls Ontario (Great Lakes level at least), installed 45 MCHH Weber, no jet change, no venturi changes, just the regular hose and connector changes with any Weber conversion,he's very pleased. Reports all runs well. Acceleration boost, horse power boost etc. And no hassle and expense of changing manifold/header et al. Kit sells retail for about $350.00 U.S.($345.00 Canadian these days)
I'm going to try it, I'll let you know results.