Well, seems after confirming with two sources (one being Jim Pace Performance Parts) Vortech heads are NOT compatible with my TPI. In fact, there are very few heads available for this combination. My story - have a rod knock in my 406, needs attention. No problem, but if I want to upgrade my heads (currently running the '87 IROC heads that the TPI came from) or go with a crate motor, ALL the heads they put with the motors are meant for the dreaded carburetor. One option is to drill out the heads, I am being told the ports don't match up properly then, or try an Edelbrock base plate for the TPI to sit on, which the guys weren't sure would be a perfect match either. Guys, any ideas or suggestions? Seems I have the following options - 1. Stick with the TPI and heads I have, freshen them up when I repair/rebuild the bottom end. 2. Go with Vortech heads and go back to carburetion (not what I ever wanted to do). 3. Try to make the Edelbrock base plate work with the TPI on Vortech heads. 4. Sell the TPI system and heads to a lucky K5 owner and go back to carb and HEI. Thanks in advance for your wisdom. '79 - 406 w/IROC TPI - K5#5 - a <font color=orange>sickness <font color=blue>you never get enough of!!