Springs and lifters.

I have recently gotten myself a basket case dart for cheap. The reman 318 is low miles, but I am upgrading the carb, intake and cam. I ordered comp cams XE 256H. I have also ordered the recommended springs 901-16. My question is it nessesary to use their lifters (another $90) or can I just use the ones that I already have in the motor. I have already put too much money in the little 318 already.
My plans are building a 440 727 combo that is just sitting in my garage. I only plan on using the 318 in the meantime. Thanks

Go easy on me Rumblefish. Haha