Hi everyone, I'm shopping for an aftermarket balancer as an upgrade from stock on my 500" stroker low deck street and strip 70 coronet. It has gone 11.70 @ 114 so I want something good. I'm looking at ATI superdamper, looks like 917122E fits a stock timing cover but pulley alignment is gone, it is a steel shell with a 3 ring design, is there an off the shelf pulley to fix this for water pump and alternator? Otherwise it's 917470E which is an aluminum shell with 2 not 3 ring design, looks like it fits a stock pulley system, does this one sacrifice performance for fittment? I also looked at ATI Rattler, looks like a solid product, any experience with one? Then Summit has a street/strip 18.1 sfi for $150 and a race sfi for $300, I was looking at both. Any suggestions or knowledge would be great, thx