Don't worry. The early 2000's national record holder in BB/A ran a simple wet sump. On a bit over 300 inches he was in the 7.60's last I remember.
If I was going to all the trouble to use an external pump I would use a dry sump. Not an external wet sump. That's silly. Unless some rule maker decided dry sumps were too expensive and made a rule against them.
I was over the external wet sump junk in the early 1990's.