I installed my springs at 2.00", but it took using increased height retainers (+0.100"), locks (+0.050"), and cutting the spring pockets about 0.040". This was with loosing 0.060" install height to the lower spring locators/cups.
The springs I used are PAC 1325 valve springs.
These are 1.55" diameter, 150 lbs @ 2.00", 765 lbs @ 1.20", good for 0.800" lift.

The Edelbrock head valve seats are cut to handle larger diameter springs, but I am not sure about rocker arm clearance with 1.625" springs?

Here you can see how close the springs are to the rockers on the shaft.