I am doing a 46 right now with a S10 complete frame using the kit from ez swap and the front fender braces still mounts to the radiator support. I have pre fit the front end parts and one you get all the bolts into the cab, inter fender, and radiator support those fender are pretty secure. PM me and I will see what you are doing wrong. Norm

My first prewar and it will not be my last. Done with the 40 for my best friend. Got a 46 (year I was born) to build for me.