RE: Pheonix Extra 330S 60-90 Size
Are you saying you are too long or too short? Sorry but I have a webra on mine and not an OS so I dont know your issue personally. Too short and of course you just shim it out with plywood or if not that much a washer behind each mount hole. Too long and you will have to just install the engine as short as you can get, adjust the cowl and rebalance the c.g.. I was fortunate that my webra had a mount that made things perfect. Normally Ihave to add plywood to make my lengths. Of thirty two planes I have only two were ever adjustable correctly with a mount. Since 3d is not your thing it will not hurt to add a few ounces of weight that plywood would add.
Hope it helps
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Acts 13:38,39... all things means wonderful news... !!!