Yes they sure are.
no
Yes, they are one and the same, displacement wise anyway. I'm going to look and see if the LS blocks are compatible with the say the LT's, and the 1st generation 350's, if they are different, might be, different block, heads, Trans mounting. 5.7=350ci in Chevrolet's.
NO.
Yes, it will.
Typical of worn bearings....crank, cam and rod bearings.
Yes, They will bolt right up.
if it is the same motor yes, but some may have different mounts or wiring plugs
No
A 195 degree should be used.
the 350 is better. depending on the year of your truck it may be the biggest motor avalible without going diesel. I have a 94 Chevy longbed single cab with a TBI 350 in it with straight pipes and it'll move
A 5.7 litre or Chevy 350 will fit as that's what the Z28 has in it, you will have to change motor mounts and all the computer wiring and computer to do it.
no the blocks are different sizes in that much of a time span