Been there Done it
That's for Holley and one of the reasons I'm going with Speedway Motors brackets.Don't forget the 21-1.
Seems everything on the Holley site requires additional parts for more money.
Haven't ordered yet because I'm having an issue with the fact you can't buy a Sanden 508 with a 6 groove pulley.
7 or 8 are available, but none of the bracket companies address this issue.
Thinking now of going with Holley and the old R4 compressor. I'm only cooling a std cab in the upper midwest. Will also be able to use stock 94 A/C lines. Saves having new ones made.