Trick flow 240s on milder builds versus Edelbrock RPMs

DC Dart said
Hello. New to the forum. I was wondering at what level of horsepower the trick flows become more advantageous over the RPMs. A lot of people are using the trick flow heads in the 550 plus horsepower level but how do they perform around 500hp. Would the RPMs have an edge in the lower horsepower levels?
Where I am going with this is that several years ago I bought a 440 source 451 stroker kit and had a 400 block machined and prepped. At the time Edelbrock RPMs were the plan with 84cc chambers. I had purchased the 4cc flat top pistons for around 10 to 1 comp. Pistons approximately .008 in the hole. The Trick flows 78cc would be a half point higher approximately. Not sure when I will have time assemble and get solid numbers. Wondering how the heads would differ around the 500 hp mark. Going to run a roller lifters and a cam in the 230s 240s duration range @.050lift? I am wondering if I should go the trick flows even though my compression would be on the high side.
The car is a 68 Dart will be 4 speed or t56 with 355 gears. May go steeper gears later. Maybe hit the track on occasion but main use would be fun street car.

Okay, went back and reread your first post again. Looks like you have not made a choice on the transmission so I'll offer some advice there. A well built 451 in a '68 Dart doesn't need a 6 speed transmission. First off that install will cost you a ton of money. Probably $5K or $6K by the time you're done and you most likely will never use 6th gear if you have 3.55 rear gears. A 5 speed could be used in a car like that but they are harder to come by. The Passon setup would be cool if you can get them.
So I'd say save your money and run a four speed. If you have money burning a hole in your pocket then use it on the engine. Get a professional shop to help you with the engine so it is smooth and powerful from idle to WOT. If you have a really nice engine then you'll be happy with four speeds.
Cam selection with a manual trans and 3.55 gears is super critical. If you go too big on the cam then you'll hate driving the car at low speeds around town. So you are going to need to stay small with the cam regardless of what people on the internet tell you to do. The people who tell you to put a big cam in it aren't paying the bills and they aren't laying on their backs under your car helping you put it together.