c130j it all depends upon the performance you are seeking and your personal expectations. If you want to fly it around gently like a Cub on the wing, it'll fly with a .46.

OTOH if you want to fly it like a Decathlon, then it needs more grunt. It is very heavy for recommended class and big (boxey, draggy fuselage).

In a two stroke it needs a powerful .50 to fly it aerobatically like a real Decathlon or at least or .61 if you want to fly it with the sort of power more adventurously aerobatic R/C fliers will want to. The real Decathlon and Super Decathlon aren't particularly fast, nor do they have the enormous amount of excess power almost limitless vertical performance we expect and most fliers are dissatisfied without in R/C flight.

IME, whilst a fine enough engine if you can live with its MAG carb, powerwise the Super Tigre .51 ring is a .46 dressed up in to appear stronger. You'll need a very strong .50 class engine such as a Magnum .52, Irvine .53 to do justice to fitting other than a .46. You'd probably get by with an OS 50SX or Enya 50CX, but I'd consider those my personal minimums with this ship.

A .61 is a better choice and what I have gone for being a two stroke man. Just make sure those wing braces are secure and firewall well epoxied!

Otherwise, any current generation .70 fourstoke seems a popular choice.