Choosing of converter help

I bought from Lenny at Ultimate Converters and was vary happy with what i got and would recommend him without hesitation.
I have only bought one from him, but it was spot on AND DROP 500 RPM OFF AT THE TOP END. As well as made a good jump in 60" as well as et and MPH.
He said it should stall around 4200 and it stalled 4100. Close enough and improved all the way around. With traction issue resolved it just might stall at the 4200 in the end!

It will be who i buy my next converter from.