That is the intake manifold casting number from a 1970 350 CI 300 HP engine.
yes.
Any 305 or 350 engine from the year 1988 to 1995 will bolt right in. The 350 would be the best 1 more power.
A 350 Motor needs 5 qaurts of oil to function properly
yes
hydromatic 400
10870
4.1 5.3 (305) 5.7 (350) 6.1(Diesel)
28-32
The best place to find a diagram for 1999 GMC 350 cubic inch engine would be a your local GM dealer. They keep diagrams and manuals on all their models.
YES, As long as the GMC 350 is a 1988 to a 1995 year then it will bolt right in and work just perfect.
If memory serves me right, you should have the TH700R4.
No, not on that year.