So you bought this car which was for sale in Alor Setar. Good choice...you got to it before i did. But changing the engine to Toyota?? Hmmm thats one thing i would never do. Engines could be rebuild unless totally gone like Cylinder head rusted or cracked. Still can source and buy a new engine from US.
I always say to my self, whats the use of buying a classic ride when you kill the heart?
Whatever it is its the owner's choice even though i have qualms.
Good luck