I just picked up a long block gm 350. Was told it had TBI ontop of it. I did some searches and figured out where to search for the #'s on the block, but not sure if i found what im looking for... The block is painted so its hard to tell on some places- Front pass. side infront of head...Couldnt find any #'s.. Front Drivers under head- 638 Drivers side behind head- GM 5.7L SGI Pass. behind head- 14093638 Rear behind distributor almost- K223 Any help???