I'm a huge fan of the XS Power and Braille "AGM" batteries. I recently had to replace the Braille in my '72 Cutlass, and it was about 12 years old.
My 10-second 2-ton Falcon wagon had the little XS Power S925 in it, about 26#, and it worked great. Even highway driving in 100+ temps, stopping for gas & drinks for 10 minutes, hit the key and the motor turned over as easy as it did when it was cool. The CCA are VERY deceiving, only rated at 640 or so. Under normal situations, the S925 will spin your motor at least as easily and quickly as a 1000cca lead-acid battery.
I went with the slightly bigger S1200 for the Cutlass. I didn't need any more cranking power, but wanted a bit more reserve power.
Lead-acid battery prices have gone WAY up recently, so the price difference between those and AGM is not so big.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
My webpage http://lnlpd.com/home
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