Nor-Cal '73 Swinger

I know rust is my worst enemy & a leaky heater core left surface rust underneath the carpets. I pulled them back & rolled under the floor pan & no holes luckily. Looks like my next step is pulling the interior & carpet & padding & killing the rust & a healthy dose of POR 15. I'm thinking I might as well lay down some Hushmat & new carpet while everything is out but that's gonna take more budget. So that may take a couple weeks. I know this is very novice work compared to some of the talent that frequents this board, but I would really appreciate your thoughts & insight on what I've done & what I should prioritize next. Especially in the area of suspension as I know this nearly 40 year old car once rode a million times better. I'll end with a shot of my boy, he calls our project, "Daddy/Jacob's Car"