1968 Formula S...modify it beyond return?

I have a 1968 Formula 340 S from California. Original engine is long gone. I have been running it with a 1970 block 416 last 5 summers. Car is great but I am ready to take it to next level. Do you guys think it matters if I add sub frame connectors and mini tubs to this car? It is kind of a rare vehicle but it doesn't seem like the general public really cares about preserving this model. It will never be original again as the motor is not original. What do you think? I have original exhaust and intake manifolds sitting in the garage and the rest of the car is fairly stock other than motor,wheels and paint.