Is there anything special I need to know about installing 4 speed clutch linkages in a auto car? I am helping a friend with the mechanical side of his restoration, and we are just about ready to install engine and trans. I know I will at least have to put a hole the firewall to fit the clutch rod boot and allow clearance for clutch rod. He is the body man, but I have to do the install. Any special considerations? How do can I be sure of exact hole placement? Thanks.  

I found out there should be a plug in the firewall/floor that was never punched out at the factory. It is in the correct place.  

it is pretty easy to switch from the auto to the 4 speed if you have all of the parts.  Do you have a donor car?  are you going to use the stock linkage or switch to a hydraulic linkage.  The stock linkage bolts to the unibody on the frame rail and attaches to the engine on a pivot.  the 5.0 blocks do not have the threaded hole for this pivot.  So I hope you are using an early engine block, otherwise I believe you can drill and tap it.  the hydraulic route works great but when I first switched over they sent me the wrong hydraulic throw out bearing and I spent a long time trying to figure out why it would not work.  turns out I probably measured wrong.  oh well.  other than that it is  a pretty easy swap.   I left the engine in when I first switched over. and again when I changed to the hydraulic.  later I swapped in  a five speed and just had to trade the throw out bearing for the slave cylinder.   one other thing.  If you are using the stock linkage I would strongly recommend reinforcing the pivot arm.  I bent mine when I installed a high performance clutch.  

I am using stock linkage and the block is early and already has the pivot hole. The problem i ran into is this: if the little "knock-out" is in the correct place, it is not large enough for a stock boot. Also, I believe the master power booster bracket will have to "modified" slightly for clearance. I also was sent the incorrect equalizer bar, so I am waiting for the correct one now.  

yeah when I did mine I used a die grinder to open up the hole a bit.  but I was using a 67 donor car so things did not line up perfectly, so I will leave that question to someone who know first hand.