375 jetting for '74 sport

[fcnomad]

Does anyone know the suggested jetting set up for a '74 350 Sport with 375 kit, stock carbs (VHB25B) stock air box and exhaust? I was told the bike I bought recently had been modified to this bore but the carbs are currently jetted to book specs which might explain the spotty running (runs on choke). All else seems in good order.
Thanks!