IMPBA Thunderboat rule question.

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IMPBA rule book t-boat engine specs
The engine may run a stock unmodified 257, 1027, or a 644 with choke carburetor.
 
Thats the same specs and ruling for the IMPBA Crackerbox class also...i did some checking on the three carbs that are allowed...and the wt-257 walbro seems to be the king...and carb of racing choice...
 
Thats the same specs and ruling for the IMPBA Crackerbox class also...i did some checking on the three carbs that are allowed...and the wt-257 walbro seems to be the king...and carb of racing choice...

WT-1027 is the same thing different number. .
 
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