It can be either a 2 or 4 bolt
350 4 bolt main
quick answer is NO, 2 and 4 bolt main engines both had the same casting numbers. you have to pull the oil pan to be 100% sure.
That should be a 4 bolt main 350
4 bolt main
3970014 350 69-77 Pass,Chevelle,Camaro, Nova,Monte Carlo 2 or 4 bolt main 3970014 350 69-79 Truck 2 or 4 bolt main 3970014 350 72 Corvette late '72,200 HP,255 HP 4 bolt main
Goodwrench crate motor 350, Made in Mexico, 260 hp, 2-piece rear main, 4 bolt main caps.
Chevy block with casting #3970010 is not a 4-bolt main block---1968--327 cid/250hp A body car---1969-79-350 cid/185hp--car , truck , vette.
That engine could be anywhere from a 1969 to 1972 350. Some of them were 4-bolt mains and some were just a 2-bolt main engine.
If the number 8999289 is a casting number inside a bell the first number is a 3. Then the block that is in question would be a 4 bolt block with 4 main caps.
1500--2 bolt, 2500 4 bolt
This # 1400207 is not listed-- could be 14010207--1980-85--- 350 4 bolt main truck engine