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Im using stock late 70's 318 head retainers & the mopar performance 444 lift (340 spec) cam with lifters

heres a pic of the retainer centered on the spring and yes it does have alittle play on the id



What is the ID of the spring ? How much is a little play ? Do you have a set of dial calipers ? What is the recommended retainer for the spring you want to use , that will give you the number you wantto check against the stock retainer .

and as scratchy said , installed height is important , you need to check that and put the springs in at the correct height .

Or just slam it together and see what happens ...