Skatepunk60

Ok i have an 85 firebird s/e and an 83 firbird s/e so i plan on kinda combining them into one car (83 is the parts car) So i wanted to change out the whole interior .. and i mean everything including carpet anddash / gauges. Are there anythings i should look out for in a swap like this?

Also for the body i want to put the 83 nose ion my 85 will it bolt up? will the bumper bolt up too? Would i need to change the bumper supports? (things in back of bumper roght befor body takes impact of a frontal / rear hit)

I need to change the doors too they are both power window , doors will it bolt up right?

and the last question how hard it it to weld a new body panel in, because the owner that had my car before me was a complete retard and backed into a truck going a good 20-30mph and the rear panel (behind lights) and the back of the drivers side quarter panel (right after the gas cap) has to be replaced. Any warnings, precautions about this?

Thank you for your time...
Joe