Yeah, I think the FlowKooler is the only High Volume 8-bolt pump.

https://www.summitracing.com/parts/bra-1622/overview/make/pontiac

But, if you have switched over to the 11-bolt timing cover & pump, there are 3 popular aluminum pumps: FlowKooler, PRW, & GMB. Some have used a Milodon brand. But, it is said that the Milodon is just a re-boxed GMB. It is also said that the aluminum housing in all these pumps are made by GMB.

https://www.summitracing.com/parts/bra-1649/overview/make/pontiac

http://www.ebay.com/itm/PRW-1445500...ump-for-Pontiac-265-455-V8-/182169889391

https://www.summitracing.com/parts/gmb-130-1280p/overview/make/pontiac

March sells a chrome plated pump.

https://www.summitracing.com/parts/mch-p170/overview/make/pontiac

And if you wanna spend closer to $300 for a pump, Edelbrock has you covered.

https://www.summitracing.com/parts/edl-88563/overview/make/pontiac

https://www.summitracing.com/parts/edl-8856/overview/make/pontiac