I never figured out why but both the new Eddy 750 and 600 I bought had hard strat issues when hot. To pinpoint I:

1). Put a 1/2 inch phenolic spacer under the carb and wrapped the new steel fuel line I ran from the pump to the carb. As directed by Eddy's techs.
2).I checked the heat riser valve to make sure that was open.
3).I did pop the top on the 600 and readjusted the float bowls to Eddy's specs. They were out of spec.
4).I ran fuel line hose only from the pump to the carb to totally get rid of the steel. This an attempt to put everything back the way it was before I got the Eddy 750.
5). Took my Carter AFB off my 68 Bee and put it on my 69. Issue went away.No hard start when hot.
6). Put a fuel pressure regulator on with gage and set to 4.5 psi with the Eddy 600 back on. Still no hot start.
7). Rebuilt the old 600 Holley that I took off my 69 to replace with the Eddy 750. Have ran the car now for almost a week. No hard start problems.

I only gave up on the Eddy 600 after almost getting stuck somewhere and not being able to get the car started. I had a hard time with the fact that 2 new carbs were doing the same thing. But.... 2 old carbs work on this car. 2 different brands also. After all this I'm going with a Holley.