Please help before 10am today. VALVE SPRING RETAINERS!!!

[89FHPLX]

I bought a set of new Crane Cam 99833-16 springs but the problem is that I cant afford the retainers.
The Machine shop guy that is doing my heads have more than 15 years experience working on E7te heads.

Hey says that with the crane cam springs and the stock retainers I can use the setup.

My friends say that to keep the stock springs on, but the machine shop guy says I wont have a problem, and I trust him.

My car has major ported E7s and a Cobra intake Lower Ported GT40 and a E-303 cam adavance to 2 degree more on the timing chain.
Your suggestions will help to make my mind about the Retainers. I might buy stock retainers from Napa or some other store.

I just cant Afford the Crane one's.

Oh yeah, my stock valve springs have 161k on them