In my humble opinion, go with the TTI Shorty's . With the Borgeson box, you should have lots of clearance and there's not a great loss of performance vs long tubes if you are not racing the car. You will certainly love the convenience gain for a daily driver / cruiser when changing spark plugs etc..
TTI shorties won’t work 383 or 400. They need the raised block to clear things including torsion bar pass side and manual steering box on drivers side. Expensive gamble on my part
