Looking for a little help. I have a 64 Chevy Impala replaced the small block with a big block and switched out the 2 spd powerglide for a 700r4 transmission, now i am having an issue with the length of the driveshaft dont know wether to have one built(cost?), have the stock cut and balanced? Also do not know where to go to start looking. I found a company that has one for my application but its $700 and don't know if thats too high. thanks for any advice!