Both will fit on either block. You need different rocker set ups for each. If you have good roller rockers already for irons id get the 8 bolt ones to save on rocker arms.
I have the TA's, but would recomend taking them apart & cleaning up the bowls. Mine had a lip from where they machined the valve openings, but other wise have been very happy with them.
Champion for me. Tom is the best for customer service. I had some issues with the heads I bought second hand and not only did he answer all of my questions, but got me fixed up with all of the stuff I needed to make it right. One of the best venders on the board. THANKS Tom!!!!!
I have the TA's, but would recomend taking them apart & cleaning up the bowls. Mine had a lip from where they machined the valve openings, but other wise have been very happy with them.
#25, like my sig says though, it was a way rich tune, 8:1 - 8.5:1 AF. After the work my dad did cleaning the heads up, a proper set of plugs, and a better tune, it should see mid tens without any problem.