Jcode: I'm definitely going to shave as much off the total cost as I can. Fit is the main reason I'm not planning on going hyd but I'll definitely check to be certain that it won't fit before I abandon it completely. Now you got me worried about using a cable. I want to get the best performance I can as inexpensively as I can and don't want to deal w/ problems down the road if I can avoid them. Assuming I'm not going hyd said:
While the old zbar linkage is very reliable, it is also antiquated and heavy on the leg. I personally would not go that direction because when I upgraded to the T5, I was looking for upgrade in the clutch pedal feel as well.
When I did my T5 and hydraulic clutch in my 68, my research uncovered the fitment issue with the brake booster like you mention. On the 67/68 cars, essentially the stock Bendix style booster is the only one (at least at that time) that would fit without issue. I didn't research for the 69 (I think that is what you have, correct?), but generally speaking the 69 has more room. So just check the facts and make sure you are not interpreting the 67/68 fitment requirements and assuming they are the same for the 69/70 cars. Maybe there are some guys on Stangnet that have done this combo that could shed some light. Also, compare the diameter of your booster against whe the factoryoem booster dimnension is. Bottom line is spend more time researching up front and you will have no regrets down the roard.