Born2Restore

HELP! Just installed a new set of mikuni RS racing carbs onto my 1981H xs1100 and the bike is back firing through the carbs. A recent restore and never heard the bike run, but it turns over well. I've checked the timing chain tensioner and it appears to be fine. I also opened up the case and accessed the timing mechanism and it doesn't look like either diagram in the OEM service manual. It doesn't have an F designation on the timing plate or the timing degree hash marks. It has a T and a C on the plate and a 4R0-10 designation stamped on the plate. Does anyone know how this is suppose to be timed? This bike was abandoned in a barn for 14 years and I've worked the past year and would really like to hear it run. The racing carbs were $1100 so any help would be greatly appreciated. Thank you in advance, Kevin