Valve springs oval port head oval port head/manifolds and ute diff 4.1:1 ratio and you would have a nice little toy that would rev when you wanted it but still return good economy if you stick with the stock cam

if you want a bit more fit the falcon Weber but make sure you spend the time to jet it up right or it will be hard to drive

you should be able to get the head and manifolds for a couple of hundred and the valve springs for hundred more diff probably couple hundred

pretty cheap fun good luck