Technical flathead blower lower pulley size

have a customers 33 ford 3w coupe running a stock 49 merc flatty.he is going to uprade to a new engine with a scott blower with 3 belt pulley on the crank.the question is how deep is the pulley from the block to the outside of the end groove as this engine is installed with very little room to the crossmember.i may have to move the engine/ trans back if not enough room. thanks

 

somebodys got a blown flathead they can measure

 

one of these guys on this post might have the info you need, http://www.jalopyjournal.com/forum/showthread.php?t=841078,,,,, Tim Jones

 

anybody else?

 

I have an 8rt with a 4-71 blower and I am using three 5/8 belts. Mine is about 3/4 inch longer than standard two belt. My pulleys are home made.