I ran a regular 16L from O'Reillys for years and it would start in the dead of winter, just fine. Really your engine should not pull over 200 amps while cranking. I think the highest I saw was 120 @ maybe 4*f, so damned cold. The reason you see such big lead acid batteries is because in 2 years they have lost almost half of their capacity, so if they are over twice what the car needs you get 4 years or more before you start seeing the diminished capacity effect your ability to start.
Not sure the strut tower brace will be out of titanium at the moment, part of it might be. Titanium won't weld to sheet steel. I keep thinking about using the pinch rail that spans the firewall for part of the mounting. I'm not going to use a 6G74 or a GTS manifold, so space isn't so much of a concern. Nothing is final right now. Plus I gotta get the car together before I can move it to where we'd be fabricating things for it.
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