welcome to the forum Dan,
as others have already given you lots of good advice, as Les has suggested its up to you what/how you build your car,
don,t dismiss the choice of going BEC, especially if its for track use only, lots of power,rear wheel drive , sequential gearbox, & a light car indeed.
As for using a sierra..... that is the most popular route of donor and they do come up now & again quite cheaply, i got my sierra for £150 with tax and test on it, just keep your eyes/ears open for when they pop up.
A zetec install is a very easy way to go, on bike carbs & megajolt an easy 170bhp or more if you use some uprated cams, but don,t forget that 170bhp in a car that weighs between 500 to 550kgs will be alot more agile than a saloon car with the same bhp, The Roadster has fantastic road holding meaning you can get the power down alot quicker than most "hot " saloons.
Enjoy the forum & good luck with your build.
cheers
andy
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