computer engine builder program
I know people slam desktop dyno, but I like it. The more info you input into it, the better the results. It helps to have things like head flow, but it has defaults for that if you don't.
What I like about it that cannot be refuted is the ability to compare different combinations and parts. It's simple to use.
I have done SEVERAL workups for people on the site that have had dyno runs either previous to what I did or after. All of them were surprised at the similarities.