dont know exactly how lean the afr went, that run was aborted. that afr wot at max rpm could of been in the 15s for all we know. remember afr changes with air temp, and that combo has been together for awhile now and ran untuned. Id expect that combo to produce 420 rwhp on dynojet, now unless something is holding the power back like cat back or headers.
with having 342s and the converter locking it will deffently hurt the mph and et since his rpms are way below peak, so in this case unlocked will result in best results for the owner. a swap to a shorter tire will help for track, something along likes of a 25" will help with afew rpms but car is deffently down on power IMHO. Sliverws6 with a 224/224 566/566 cam did 385 rwhp with 323s thru a 3600 stall with stock 00 heads. His best ET was 11.8@112 Vettedoctors did that tune back around 04