55.2-59 Mustang ii help

[Missyblue]

Mustang ii help for a 1957 gmc truck. Those of you who have done it how did you adapt to the radiator support? Did you leave part of the original crossmember in and just trim it back on the backside for the rack and pinion?. Or remove it and alter radiator mount somehow? My kit came with a new stabilizer bar to put in the front and supposed to remove the original crossmember but I know the chevy radiator support is different so hoping for help and what works nice.
Also any other tips regarding this process.
Easiest way to remove rivets?
Centering the tire. Feel like I see many that are forward and back in the wheel opening want to keep centered....
Put frame on Jack stands or how do you prefer to set up and level it?

Etc..
Thanks! Excited and nervous for this big step forward