well i got this complete motor at a super price and i guess i will find out exactly what i bought this weekend, i gotta drive over 550 miles to get this surprise, but i think either way i will still be happy with what i got , i only purchased it for the heads but hey the whole deal is even better, maybe i will luck out and it is a true 406 tri-power that someone replaced the intake with a 4 bbl intake,,,i will garantee you that i am taking my calipers along to end my suspence, and on the other hand it will be a high compression 390 4 bbl, no loss either way