Do I need a Stall converter?

Hello,

I wanted to see if its worth it to spend the money on a stall converter. Right now my 73 Valiant has a 318, with huges whiplash cam and 3.55 rear gears the transmission has a B&M shift kit that I added when I did the rebuild otherwise it is stock with the stock converter.

It will soon be swapping out the 318 for a 340 I am building. Compression is about 9.1:1 and the cam is a Comp solid 270/270 with .468/.468 PN CL20-246-4

The car is just going to be a Street car with some more HP then my 318. About (340-360 HP)
My machinist recommends a 2500 Stall, but after seeing some older posts on here about the stock stall speed on stock converters leads me to ask is it worth it to spend that kind of cash.

Here is a pic I found showing the factory stall range, its for 72 but surely it cant be to far off for the following year.

stall.png