I'm thinking about removing the ac/ heater box on the fire wall. Putting a ac/heater delete plate and with that stiffing the fire wall. Mounting a under dash heater to the duct inside the car so all the vents work and wiring the switch to the stock fan switch.. I found this under dash heater that summit has for sale https://www.summitracing.com/parts/sum-991102-1 . Also I figured it looks clean having a smooth fire wall, plus there's engine room when the time comes to swap.