I switched back to 1:1 linkage and took it for a drive. I'm not sure I can really tell the difference. Progressive linkage has a softer feel down low while 1:1 is a little more abrupt, but once you get past the tip in point they feel roughly the same.

I pulled onto the freeway to do a little testing and there was a Mercedes SLR McLaren in the next lane. I rolled into the throttle to see how the tune was working the SLR decided to see if he could take me. Pretty much a dead heat which isn't surprising. The SLR is 600 hp and 4000 lbs which is basically the same as my '65. He had a passenger in the car so he was probably 200 lbs heavier. Not a real race, we just rolled from 60 to 100 then I backed off to take the next exit. Too much traffic to really jump on it hard.