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If you go with 2 motors, I like the inline mounting idea better. A belt system is going to be fragile (think 500+ lb/ft of torque) and inefficient, and, unless you build a bearing carrier, will wear out the bearings on both motors. If you got two 9" motors, one double-shafted, you could mount them inline and really take advantage of that long engine bay.
I'd have to second the lithiums (if you're looking at two motors, monster controller, custom digital dash, etc., what's an extra $1-2k to save 900 pounds?) If you absolutely must go with AGMs, look at the Exide Orbitals. They can dish out more current than the Optimas for a similar price, and there have been quality control concerns on the EVDL about recent Optimas.
Good luck, and keep us posted!
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