Have a huge T-shirt quilt to make, and need info. on best type
of fusible interfacing for back of my 14" square blocks.
Quilt will have sashings between blocks and a border but
these won't have interfacing. Project will then be machine
quilted . Your advice needed as I must start this by weekend.
Just bought Pell Sof-Shape fusible non-woven .... will this work?

I used light weight fusible pellon for the one I just finished

You can use the cheapest fusible interfacing from Joann..

light weight pellon is also what I use.

I like to use Quilt Smart (the unprinted).