At that point you really need to do a complete evaluation on the whole car and look at the upper and lower cowl, inner rocker reinforcements and floor and frame. Also look at all your trim, interior, seats, suspension, wiring and miscellaneous and ask yourself to what extent are you going to take the restoration to and for what reason. Adds up fast let alone the time to do it all. Can find 136 rollers in pretty fair shape for the cost of just your sheet metal, consumables and time, unless you own a body shop.
As light as it is now maybe a drag strip sleeper like the Calculated Risk 4 door?
That is unless you just need something to keep your self busy with rebuilding and spending some money on or if it’s an SS on the rare side.
Just a thought.