I would use the 4" stroke with a 4.350 bore and add the weight where you want it. Unless your gonna run a turbo. Ray Cox runs that combo (Nitrous)into the high to mid 8's currently carrying that kind of weight. Are you allowed to use a progressive timer?
The ET streets are slicks basically and have seen BBC's run into the 7's with them. They already run 7.60's with M/T Drag radials and stock suspensions.
I run a 535 and have the smallest combo around here for the local stock supsension class. Most are 632's.
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