Hi justin,
From previous builders experience the easiest route is to use the engine and donor parts form your donor, Sierra i presume. You wont get the best of power plants but your donor parts will be good of which there are plenty of upgrades available for them and the engine will be a good basis to get familiar with the car and how it handles and will still put a smile on your face. But the main advantage is that the car will be easier on emissions to pass IVA and once your car is registered for pre-cat emissions tests it has that classification for life no matter what engine you decide to put in. Then you can really start to play and it wont really cost you more money as you already have the donor engine anyway. It's best to worry about getting your roadster on the road first and if you're considering upping the power think about upgrading the chassis to 2mm wall tube wont add too much to the weight but will give a stronger and stiffer chassis.
Builders do it different ways but to me this is the most logical..........Andy
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