gotta pull motor out, heads and oil pan, all bolts will be exposed then u can change them, major surgery
yes
Yes, that should be ok.
5 mains, 8 connecting rods
65 ft-lbs on cylinder heads and 45 ft-lbs on connecting rods
Bottom of the block above the oil pan and at the base of the connecting rods.
You'll need a special fixture and a press. Check with a local engine builder to see if they will do it for you.
yes
How do I change from standard rockers an push rods to roler rockers
yes brc 61 rods will work in a small block chevy motor. there come in diffrent rod lenghts . i have a set of 5.7brc rods. you can goggle brc for spec. on all there rods but there dont make rods or cranks any more,just pistons. if you would like to buy the set that i have ,i would sell them to you. cheap! you can email me at jamesfoneil@gmail.com
45 lbs
A Vortec crank is a large journal, 350 ,one piece rear seal crank like all the millions of others. Two ten rods.
The small block 350 uses a smaller main bearing diameter than the Small block 400. To run a 400 crank in a 350 the crank must be "turned" down at a machine shop to fit the 350 bearing diameters. You also will need to use special pistons with the correct compression height for the 350 IF you are using the 5.7 inch 350 connecting rods. If you use the 5.565 inch 400 connecting rods , then you can use regular 350 pistons. The longer stroke 400 crank also requires that you provide additional clearance inside the block, by grinding notches to eliminate the crank hitting the block and other parts. Finally, the entire engine must be re-balanced to make sure that the engine does not vibrate. The 400 is externally balanced and the 350 is internally balenced so you need to use 400 flywheel and 400 harmonic balancer.