The 13204 can handle more hp with the A1000 but if you plan making more or upgrading later (who has enough power) the 12302 is a better fit and can be mod'd to work better with the A1000.
Motor
IF a 5.850" rod will clear the crank yes. I would do the swap and upgrade to ARP 2000 or better bolts. This will allow for a much better ring stack. Don't forget you need good pins also. Good pistons custom piston like BRC don't cost much more than other 2618's OTS.
Turbo
A large single is fine. Some guys can not figure out a motor with two banks can spool a single turbo so they have to go twins... lol (j/k) The will have half as many parts. Do the single. DO NOT DO A T-4.
A T-6 1.32 S480 or similar will be fine. JGS BOV and W/G would be fine.
Trans
If it is a track only car the glide would be fine. If it will see street time the TH400 is bonus the extra gear adds to the driveability. Plus the TH350 conv will fit the TH400.
What are you doing for header?
Motor
IF a 5.850" rod will clear the crank yes. I would do the swap and upgrade to ARP 2000 or better bolts. This will allow for a much better ring stack. Don't forget you need good pins also. Good pistons custom piston like BRC don't cost much more than other 2618's OTS.
Turbo
A large single is fine. Some guys can not figure out a motor with two banks can spool a single turbo so they have to go twins... lol (j/k) The will have half as many parts. Do the single. DO NOT DO A T-4.
A T-6 1.32 S480 or similar will be fine. JGS BOV and W/G would be fine.
Trans
If it is a track only car the glide would be fine. If it will see street time the TH400 is bonus the extra gear adds to the driveability. Plus the TH350 conv will fit the TH400.
What are you doing for header?