273 Supercharged...ITS HAPPENING PEOPLE!!

You should check your comp ratio while you have it apart and try and raise it to the safest level you can with the boost your using, Check the cam profile too. If you stick with the 727 auto ( poorest choice in my opinion) then you will need a custom torque converter.
Running the 727 and the blower is going to put load on the engine from the get go, so you need to produce as much low end as you can to compensate or it may not like to idle in gear or be a real slug down low until you build some boost, which is typically only up in the higher rev ranges with a centrifugal blower.

Comp ratio will for sure be checked when going back together. I am a bit stuck on the cam. Was planning to replace but I'm not sure what to go with. Was going to talk with local shop guy next week Do you guys have any thoughts on specs?

I'm only thinking 5 lbs on this thing. BUT.... Eagle forged rods are do able. I'm thinking about a set of custom forged pistons also but I haven't fully decided if the juice is worth the squeeze. How much more boost is safe on a stock block and stock heads? How much power will the stock cast crank tolerate? Any thoughts? It's about another grand for rods and pistons. Might set my time schedule back but might net me a big jump in power and reliability.

I'm sorry but the 904/727 debate is getting old. Not to seem like I'm taking it out on you but I understand how it draws more power. I understand it's not what some would choose. For me it makes sense. It's a 727 going in the car. If I hate it or later down the line I will go at the 904. I have bigger fish to fry right now.