454cid
Sooper Pooper
Any 34/78 battery should drop right in. I've got an Odyssey 1000CA/850CCA in my red truck, and two DieHard 900 CA/800CCA batteries in my crew; they fit in the battery trays just fine.
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How do you like the Super Starts? I've been having a hell of a time with the DieHards in my 6.5.
The larger battery is normal for my truck. I think the smaller one is listed as an alternate size, when I put my truck into the computer at Walmart. The vans get an even larger battery, but I don't think our battery trays are big enough for it.