Thought I posted this already??? ...Anyway-
The number is usually on a tag under one of the front screws holding the top on. Some also have it stamped on the side of the mounting ear located on the linkage side, front.
The "1.08" is the venturi size (common for ~289CID engine):
X.XX = CFM
0.98 = 190
1.01 = 240
1.02 = 245
1.08 = 287
1.14 = 300
1.21 = 351
1.23 = 356
1.33 = 424
All 2100's are curved across the back -- 2150's are straight. See below:
2100ID.jpg 2150ID.jpg
This Dashpot-Solenoid should work either way, IF your's has the correct mounting holes.
$hop around tho!!