Are you starting with nothing or do you have something now, a top swapped l26 will make quite a bit more power than a l67 due to the higher compression
Find a higher mileage motor like in the 150k range. It'll cost a lot less and it'll be just fine. Will probably make more power as well. Turbo guys are making or have made 500+whp with close to 200,000 mile motors. They don't wear out, they just get faster. It's really a shame there just aren't any viable solutions for the transmissions wearing out.