budget street motor 360 or 383 for 71 duster

Hi guys thanks for the replies forgot to mention I'm in Canada so my money doesn't go as far up here. My plan is probaby to use the 360 I have currently if it' cheaper and build it but is it even possible to build a stroker for 5k ? What would be needed to make the 383 make 400 to 450hp would it be cheaper to do that way and sell mine as a running motor that way? I need my duster to beat my buddies 68 chevelle that has a built 383 with about 475hp in it. Thanks again for the help