I have a 73 Dart Sport that was a 340 car. I am going to put a big block in it using a motor plate. I this K-frame worth removing and using any a-body k-frame like out of a 6-cyl or is the V-8 k-frame stronger? This is going to be a strictly strip only. Also - I thought 73 was the transition year to tegh 4 1/2 bolt pattern - where 4" BP on the drum cars and 4.5 on the Disk. I must thougth worng as this car has 4.5" BP with drums. - How hard is this to change to disk? will I need new spindles?

Thanks!
Jim