49 chevy sbc/th350 conversion question

I'm doing a sbc/ th350 conversion on my 49 fleetline.

Not sure if I need a short or long tail shaft trans or if it doesn't matter.
I'm just worried about driveshaft length and angle. I'm using a s10 rear.

 

It doesn't matter. The short tail transmissions are usually easier to find, in case you need to replace it. But if you might swap in a 700R4 later, the long tail 350 is the same length as the 700, iirc.

 

X2 doesn't matter

 

thanks guys

 

In my 51 Canadian Pontiac ( same as Chevy) I used a long tailshaft ****** and the mounting pad was farther back than the crossmember - I used a Ch***is Eng crossmember kit and engine mounts.
I had to do a bit of "adjustment and modification" to make it work. Basically I made a bracket to move the mount back a bit (it was too long ago to remember any dimensions).